Android: SSO on Twitter

Please help me out I am getting this error

 04-09 15:18:49.120: W/System.err(8085): oauth.signpost.exception.OAuthCommunicationException: Communication with the service provider failed: api.twitter.com
  04-09 15:18:49.123: W/System.err(8085):    at oauth.signpost.commonshttp.CommonsHttpOAuthProvider.retrieveToken(CommonsHttpOAuthProvider.java:106)
  04-09 15:18:49.123: W/System.err(8085):    at oauth.signpost.AbstractOAuthProvider.retrieveRequestToken(AbstractOAuthProvider.java:66)
 

I am using this link https://github.com/brione/Brion-Learns-OAuth example. Please can u say me where I am going wrong..

Thanks in Advacnce..

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